72989631 has 24 divisors (see below), whose sum is σ = 123863376. Its totient is φ = 40832640.

The previous prime is 72989629. The next prime is 72989677. The reversal of 72989631 is 13698927.

72989631 is a `hidden beast` number, since 7 + 2 + 9 + 8 + 9 + 631 = 666.

It is not a de Polignac number, because 72989631 - 2¹ = 72989629 is a prime.

It is a super-2 number, since 2×72989631² = 10654972467032322, which contains 22 as substring.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72989831) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27070 + ... + 29643.

It is an arithmetic number, because the mean of its divisors is an integer number (5160974).

Almost surely, 2^72989631 is an apocalyptic number.

72989631 is a deficient number, since it is larger than the sum of its proper divisors (50873745).

72989631 is a wasteful number, since it uses less digits than its factorization.

72989631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56743 (or 56740 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 72989631 is about 8543.3969239407. The cubic root of 72989631 is about 417.9141307705.

It can be divided in two parts, 729896 and 31, that added together give a palindrome (729927).

The spelling of 72989631 in words is "seventy-two million, nine hundred eighty-nine thousand, six hundred thirty-one".